Consolation: S&B Ultra Short, Kahles 3-18 looks promising, and while it has an oddball 36mm tube, the ZCO Zero Compromise (they will make a name for themselves...mark my words) has a 4-20x coming soon.
I think the 1-8x stuff on a 16"+ gas gun is a bit romanticized at this point. When it's the right tool for the job/location, it's dynamite...but when it isn't the right tool, it's a real bear. The 417/MR762 16" isn't the slimmest girl at the dance, might as well use a full-powered optic and see how far you can push it.
Regarding the mount, work backward. Don't buy by brand to start. Figure out what you need first and THEN figure out what companies have what you need. As I said, NF doesn't have a 0 MOA mount; Spuhr doesn't have an Ultra Short mount WITH cant (if you want/need it). Badger Ord hasn't had some of the mount heights I've needed for certain ring sizes. Certain Schmidt & Bender's will bottom out on some Spuhr's. Height, cantilever, are you using NV, etc.